They generally seem to be more natural and in place with the movies.
Most animes it's fairly obvious the english was done on top and focused on a child audience.

Miyazaki movies tend to not give that feeling for me, it seems to belong and seems to fit an adult audience too.
Granted, the Japanese voice acting is probably still better in most cases. But the english is passable to the extent you can definitely enjoy it (in my mind) in english without missing much, unlike most animes.